Die stock



Aug. 23, 1932. F, JUDGE 1,873,132

DIE STOCK Filed Nov. 2. 1929 2 Sheets-Sheet l F. JUDGE Aug. 23, 1932.Y

DI STOCK Filed Nov. 2. 1929 2 Sheets-Sheet 2 Patented Aug. 23, 1932isialszf FATE-fiar.

& DIE CORPORATION, OF SACHUSETTS Y @anser-ism, massacri-esserneooerennrlelv or DIE Strooi;l

Application filed November 2, 1929. Serial No. 464,480. i

This invention relates to a. die stock of the type used for holdingthread cutting dies.

It is the object of my invention to provide new and improved means toradjusting the cutters in a. die stock so that a thread of the desireddiameter may be produced.

A further object is to provide improved means for centering the work ina die stock while the thread is being started.

My invention further relates to arrange ments and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of the invention is shown in the drawings in which Fig.1 is a plan view of my improved die stock;

Fig. 2 is a side elevation thereof, looking in the direction or" thearrow 2 in Fig. l;

Fig. 3 is a sectional side elevation, taken along the line 3-8 in Fig.1;

Fig. 4i is a plan view of the die stock with the cover plate removed;

Fig. 5 is a plan view of the casing, showing certain cam surfaces;

Fig. 6 is a plan view of the cuttersupport;

Fig. 7 is a partial side elevation thereof, looking in the direction ofthe arrow 7 in Fig. 6; and

Fig. 8 is a bottom view of the die stock showing the means forsupporting the work.

Referring to the drawings, my improved die stock comprises a casing 10having opposite projecting portions 12 in which handle rods 13 aresecured. The casing 10 is provided with a series of inner cam surfaces14 and is threaded to receive adjusting screws 15 and 16, all forpurposes to be described.

A disc-like cutter support 2O is mounted for limited angular movement inthe casing 10 and is provided with a plurality of spaced guideways 22adapted to receive cutters 24. These cutters 24 are freely slidable inthe guideivays 22 but are yieldingly engaged bv spring-pressed balls 26at the sides thereof, which act to retain the cutters 24 from accidentaldisplaceemnt when the support is removed from the casing 10.

The support 20 is provided with spaced shoulders 28 positioned forengagement by the inner ends otj'thead-j'usting screws l5 16.'V 'Theouter endso'f the cutters 2A are shaped .to correspond `to the camsurfaces 14 which' they-directly engage. ,Y

vA cover plateBO is'` secured' to the lsupport 20andprevents outward'dispilaceinentv ofthe cutters .24e The cover p 'late SOprojects `.be-Yyond Nthe "cylindrical outer tace of the support'2`0 and-isgengagedtbyclamping collarsor' washers-32 securedto the casing 10 by screws 33."TheV collars 32 are slabbed oiiatone side,l as indicated ati, sothat.the cover plate and cutter support together with the cutters'mayV i beremoved as a unit byturning the washers .32 an'gularly, but withoutentirelyl removing thesa'mefrom'the-casing 10.; j

zWith this construction,` it Willbe Seen that thecutters 24 are eachvfirmly seatedv V'against oneof`thecam surfaces V14 and that by loosen-Vj ing the Vadjusting screw 16 and' `tightening the screw 15, the cuttersmay be. sirhultane'v ollslyv and equally 'forcedfinward to ldecreasethe` sizeof'thetthreadto be cut. The reverseA operation 'will permit thecutters to Ebe forced outward,v causing @an increase in .the threa'djfdiameter.

The cover'plalte 30 mayfbe vprovided. with anlinde'xfline 40 :(F'e- '1)'Coppermine With f1- corresponding-index line 421on'thge casing 10, sothat the direction and-:amountoffadjustmenty may bewisibly indicated;A*v A disciorbottom plate islplacedtinto the cylindrical opening iotthefcasinglO and :is heldtirom rotation AVtherein"by a p'i'n' 51 (Fig. 'i8) `A plurality of work-.engagingaingers arepivoted at "58":.0i` the `jol'ate wand-are provided with pins 5e' projecting `,outwardintocanrslots :formedfinfatlanged'cap or cover 'f 56.rlg-h'e-tlangedportion'57'ofthe cover `56 is centeredin anannular'recessI .58ct the plate 50. Thel portion '57 is-also" providedwith. an annular groove lto-receivethe concave edge portions of Aclamping Vplates 62, secured 'by clamping scrcwsf. 31"

A'VVhe-n -"the` "screws 463 are loosened, the* flanged cover plate 56may be turneda'ngular'ly `to vadj ustthe fingers"52 to the diameter j ofthe Work to be Aengaged thereby." The" parts` arev then secured'i-n-thedesired position by tightening the Screw 63.

1 A thereto adj of cutters slidably mounted in said guideways I havethus provided a die stock in which the cutters maybe readily adjusted totake up wear or to provide a desired oversize or undersize thread.

I have also provided improved and effective means Jfor centering thework in the die stock while the threadis being started. All parts are ofsimple and eii'ective construction, easily manufactured Vand not liableto injury or breakage when in use.

Having 'thus described myinvention and l the advantages thereof, I donot wish to be limited to the details herein disclosed, other; A wisethan as Set forth inthe claims, but what Iclaimisz 1. A thread cuttingmechanism comprising a casing, a cutter `support mounted for a limitedangularadjustment in said casing and comprising a' bodyV member havingguideways therein anda plate rigidly con nected theretov adjacentsaid'guideways, a plurality of cutters slidably mounted in saidguideways and retained therein by said .plate7 said body member, cuttersand plate being removable rom'the casing as a unit, meansV to adjustsaid support angularly, and cam means effectiveto slide each cutterinward as said support is adjusted angularly in said casing. Y l

2. A thread cutting mechanism comprising a casing, a cutter supportmounted for a limited angular adjustment in said casing and comprising albody membery having guideways therein and a plate rigidly connected'acent said guideways, a plurality,

andV retained therein by said plate, said body member, cutters and platebeing removable` from the c-asing as a unit, means to adjust.

said support angularly, cam means effective: to slide each cutter inwardas said support is adjusted angularly in said casing, and

means to retain said support in position ing the casing including arotatable washer hav-- ing a slabbed-off side.

3. A thread cuttingmechanism compris ing a casing, a cuttersupportmounted for a limited angular adjustment in said casing' and comprisinga body member having guideways therein and a plate rigidly connectedthereto adjacent said guideways, a plurality Y of cutters slidablymounted ink said guide ways and retained therein by said plate-Y, saidbody member, cutters and plate being removable :tronithe casing as aunit, and means:

to adjust said support angularly, said casing,v

haying cam surfacesformed thereon and positioned to engage the outerends of said cut-4 ters and effective to slide eachl cutter inward 'l'as said support is adjusted angularly in said casing.

^ In testimony whereof I have hereuntov affixed my signature. y

FRANKLIN JUDGE- Y

